/*
 * Copyright (C) 2008 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.hpin.mlxteacher.zxing.decode;

import android.app.Activity;
import android.content.ActivityNotFoundException;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.provider.Browser;
import android.util.Log;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.DecodeHintType;
import com.google.zxing.Result;
import com.hpin.mlxteacher.R;
import com.hpin.mlxteacher.zxing.CaptureActivity;
import com.hpin.mlxteacher.zxing.camera.CameraManager;
import com.hpin.mlxteacher.zxing.view.ViewfinderResultPointCallback;

import java.util.Collection;
import java.util.Map;

/**
 * This class handles all the messaging which comprises the state machine for
 * capture.
 * 
 * @author dswitkin@google.com (Daniel Switkin)
 */
public final class CaptureActivityHandler extends Handler {

	private static final String TAG = CaptureActivityHandler.class
			.getSimpleName();

	private final CaptureActivity activity;
	private final DecodeThread decodeThread;
	private State state;
	private final CameraManager cameraManager;

	private enum State {
		PREVIEW, SUCCESS, DONE
	}

	public CaptureActivityHandler(CaptureActivity activity,
			Collection<BarcodeFormat> decodeFormats,
			Map<DecodeHintType, ?> baseHints, String characterSet,
			CameraManager cameraManager) {
		this.activity = activity;
		decodeThread = new DecodeThread(activity, decodeFormats, baseHints,
				characterSet, new ViewfinderResultPointCallback(
						activity.getViewfinderView()));
		decodeThread.start();
		state = State.SUCCESS;

		// Start ourselves capturing previews and decoding.
		this.cameraManager = cameraManager;
		cameraManager.startPreview();
		restartPreviewAndDecode();
	}

	@Override
	public void handleMessage(Message message) {
		int what = message.what;
		if (R.id.restart_preview == what) {
			Log.d(TAG, "Got restart preview message");
			restartPreviewAndDecode();
		} else if (R.id.decode_succeeded == what) {
			Log.d(TAG, "Got decode succeeded message");
			state = State.SUCCESS;
			Bundle bundle = message.getData();
			Bitmap barcode = null;
			float scaleFactor = 1.0f;
			if (bundle != null) {
				byte[] compressedBitmap = bundle
						.getByteArray(DecodeThread.BARCODE_BITMAP);
				if (compressedBitmap != null) {
					barcode = BitmapFactory.decodeByteArray(compressedBitmap,
							0, compressedBitmap.length, null);
					// Mutable copy:
					barcode = barcode.copy(Bitmap.Config.ARGB_8888, true);
				}
				scaleFactor = bundle
						.getFloat(DecodeThread.BARCODE_SCALED_FACTOR);
			}
			activity.handleDecode((Result) message.obj, barcode, scaleFactor);
		} else if (R.id.decode_failed == what) {
			// We're decoding as fast as possible, so when one decode fails,
			// start another.
			state = State.PREVIEW;
			cameraManager.requestPreviewFrame(decodeThread.getHandler(),
					R.id.decode);
		} else if (R.id.return_scan_result == what) {
			Log.d(TAG, "Got return scan result message");
			activity.setResult(Activity.RESULT_OK, (Intent) message.obj);
			activity.finish();
		} else if (R.id.launch_product_query == what) {
			Log.d(TAG, "Got product query message");
			String url = (String) message.obj;

			Intent intent = new Intent(Intent.ACTION_VIEW);
			intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
			intent.setData(Uri.parse(url));

			ResolveInfo resolveInfo = activity.getPackageManager()
					.resolveActivity(intent, PackageManager.MATCH_DEFAULT_ONLY);
			String browserPackageName = null;
			if (resolveInfo.activityInfo != null) {
				browserPackageName = resolveInfo.activityInfo.packageName;
				Log.d(TAG, "Using browser in package " + browserPackageName);
			}

			// Needed for default Android browser / Chrome only apparently
			if ("com.android.browser".equals(browserPackageName)
					|| "com.android.chrome".equals(browserPackageName)) {
				intent.setPackage(browserPackageName);
				intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
				intent.putExtra(Browser.EXTRA_APPLICATION_ID,
						browserPackageName);
			}

			try {
				activity.startActivity(intent);
			} catch (ActivityNotFoundException ignored) {
				Log.w(TAG, "Can't find anything to handle VIEW of URI " + url);
			}
		}

		// switch (message.what) {
		// case R.id.restart_preview:
		// Log.d(TAG, "Got restart preview message");
		// restartPreviewAndDecode();
		// break;
		// case R.id.decode_succeeded:
		// Log.d(TAG, "Got decode succeeded message");
		// state = State.SUCCESS;
		// Bundle bundle = message.getData();
		// Bitmap barcode = null;
		// float scaleFactor = 1.0f;
		// if (bundle != null) {
		// byte[] compressedBitmap =
		// bundle.getByteArray(DecodeThread.BARCODE_BITMAP);
		// if (compressedBitmap != null) {
		// barcode = BitmapFactory.decodeByteArray(compressedBitmap, 0,
		// compressedBitmap.length, null);
		// // Mutable copy:
		// barcode = barcode.copy(Bitmap.Config.ARGB_8888, true);
		// }
		// scaleFactor = bundle.getFloat(DecodeThread.BARCODE_SCALED_FACTOR);
		// }
		// activity.handleDecode((Result) message.obj, barcode, scaleFactor);
		// break;
		// case R.id.decode_failed:
		// // We're decoding as fast as possible, so when one decode fails,
		// start another.
		// state = State.PREVIEW;
		// cameraManager.requestPreviewFrame(decodeThread.getHandler(),
		// R.id.decode);
		// break;
		// case R.id.return_scan_result:
		// Log.d(TAG, "Got return scan result message");
		// activity.setResult(Activity.RESULT_OK, (Intent) message.obj);
		// activity.finish();
		// break;
		// case R.id.launch_product_query:
		// Log.d(TAG, "Got product query message");
		// String url = (String) message.obj;
		//
		// Intent intent = new Intent(Intent.ACTION_VIEW);
		// intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
		// intent.setData(Uri.parse(url));
		//
		// ResolveInfo resolveInfo =
		// activity.getPackageManager().resolveActivity(intent,
		// PackageManager.MATCH_DEFAULT_ONLY);
		// String browserPackageName = null;
		// if (resolveInfo.activityInfo != null) {
		// browserPackageName = resolveInfo.activityInfo.packageName;
		// Log.d(TAG, "Using browser in package " + browserPackageName);
		// }
		//
		// // Needed for default Android browser / Chrome only apparently
		// if ("com.android.browser".equals(browserPackageName) ||
		// "com.android.chrome".equals(browserPackageName)) {
		// intent.setPackage(browserPackageName);
		// intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
		// intent.putExtra(Browser.EXTRA_APPLICATION_ID, browserPackageName);
		// }
		//
		// try {
		// activity.startActivity(intent);
		// } catch (ActivityNotFoundException ignored) {
		// Log.w(TAG, "Can't find anything to handle VIEW of URI " + url);
		// }
		// break;
		// }
	}

	public void quitSynchronously() {
		state = State.DONE;
		cameraManager.stopPreview();
		Message quit = Message.obtain(decodeThread.getHandler(), R.id.quit);
		quit.sendToTarget();
		try {
			// Wait at most half a second; should be enough time, and onPause()
			// will timeout quickly
			decodeThread.join(500L);
		} catch (InterruptedException e) {
			// continue
		}

		// Be absolutely sure we don't send any queued up messages
		removeMessages(R.id.decode_succeeded);
		removeMessages(R.id.decode_failed);
	}

	private void restartPreviewAndDecode() {
		if (state == State.SUCCESS) {
			state = State.PREVIEW;
			cameraManager.requestPreviewFrame(decodeThread.getHandler(),
					R.id.decode);
			activity.drawViewfinder();
		}
	}

}
